lst=['xie','zhuo','yu']
print(lst)
lst2=list('xiezhuoyu')
print(lst2)
print(lst2.count('x'))
lst3=list(range(1,10,3))
print(lst3)
print(lst+lst2)
print(lst3*2)
lst4=[10,20,30,40,50]
#del lst4
print(lst4)
